Muffler



Dec. 7, 1937. o. c. FISCHER MUFFLER Filed Oct. 16, 1956 By My 19%Aiiorney Patented Dec. 7, 1937 MUFFLER Application October 16, 1936,Serial No. 106,004

2 Claims. (01. 181-57) UNITED STATES PATENT OFFICE The present inventionrelates to new and useful improvements in mufilers particularly forinternal combustion engines and has for its primary object to provide,in a manner as hereinafter set forth, a device of this characterembodying a novel construction, combination and arrangement of partsthrough the medium of which the exhaust of the engine will beeffectively silenced while at the same time creating a minimum of backpressure.

Other objects of the invention are to provide a muffler of theaforementioned character which will be comparatively simple inconstruction, strong, durable, highly eflicient and reliable in use,compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of the followingspecification, taken in connection with the accompanying drawing whereinlike characters of reference designate corresponding parts throughoutthe several views and wherein:

Figure 1 is a view in vertical longitudinal section through a mufflerconstructed in accordance with the present invention.

Figure 2 is a horizontal sectional view taken substantially on the line2-2 of Figure 1.

Figure 3 is a view in front elevation of the invention.

Referring now to the drawing in detail, it will be seen that theembodiment of the invention which has been illustrated comprises acircular metallic casing I of any suitable dimensions havingsubstantially fiat, opposed side walls 2. Projecting horizontally fromthe lower portion of the periphery of the annular casing I is an inletand an outlet 3 and 4, respectively. As illustrated to advantage inFigures 2 and 3 of the drawing, the inlet and outlet 3 and 4,respectively, are not in alignment with each other.

Extending upwardly from the periphery of the casing I adjacent the inlet3 is an arcuate baflle 5. Additional curved baffles 6 are provided inspaced concentric relation to the bafile 5. It will be observed that thespaces between the baflles 5 and 6 communicate with the inlet 3 forreceiving the exhaust gases therefrom. It will also be noted that all ofthe baffles 5 and 6 terminate, at

their upper ends, in spaced relation to the periphery of the casing Iabove the inlet 3.

Extending upwardly from the lower portion of the periphery of the casingI at the bottom of the outlet 4 is an arcuate baffle 'l. The referencenumeral 8 designates an arcuate baflle which is arranged in staggered,spaced, concentric relation to the baffle "I. As shown to advantage inFigure 1 of the drawing, the bailles l and 8 are oppositely curved withrespect to the baffles 5 and 6.

It is thought that the operation of the invention will be readilyapparent from a consideration of the foregoing. Exhaust gases from theinternal combustion engine enter the casing I through the inlet 3 andare deflected upwardly by the baffles 5 and 6, said exhaust gasespassing between said baffles. After leaving the baffles 5 and 6 andexpanding in the upper portion of the casing I, the exhaust gases passdownwardly between the baffles 5 and 8, then under the latter, thenupwardly between said baffle 8 and the baffle l, and then over thelatter and then downwardly to the outlet 4. The gases also expand in thelower portion of the casing l before entering between the baflles l and8 and after passing over said baffle 1.

It is believed that the many advantages of a muffler constructed inaccordance with the present invention will be readily understood, andalthough a preferred embodiment of the device is as illustrated anddescribed, it is to be understood that changes in the details ofconstruction and in the combination and arrangement of parts may beresorted to which will fall within the scope of the invention asclaimed.

What is claimed is:-

1. A muffler of the class described comprising a drum-like casingprovided below its horizontal center with opposed inlet and outletports, respectively, a series of spaced apart similarly curved bafflesupstanding from the inlet port,

. said series being graduated in height, a baflle upstanding from thebottom of the outlet port, and a baffle depending from the casingintermediate said series of bafiles and said outlet port baffle, saidoutlet port baflle and said intermediate baffles being oppositely curvedrelative to said series of baffles.

2. A mufiler of the class described comprising thereof, and a baifiedepending from said casing intermediate the series of baffles and saidoutlet port baifle, said depending and outlet port bafiie beingoppositely curved relative to said series of bafiies, and said dependingbaffle overlapping said 5 outlet port bafile.

OLIVER C. FISCHER.

